Door check



July 26, 1949. K, KOLBUS 2,477,486

DOOR CHECK Filed Feb. l1, 1946 i INVENTOR KARL KoLBUs ATTORNEYS Patented July 26, 1949 UNITED N STATES PATENT OFFICE f 2,477,486

Doon CHECK Karl Kolbus, Milwaukee, Wis. Application February 11, 1946, Serial No.` 646,822

2 Claims.

My invention refers to spring controlled door checksA and it has for itsprimary object to provide a compact convolute spring and linkconnection to a piston rod, mounted in a cylinder, whereby a door, in approximately full open position, neutralizes the spring pressure, which pressure gradually increases when the door swings to a closed position, to thus insure full spring tension to hold the door positively shut and relieve said pressure when fully opened.

A further object of my invention is to provide all door check actuating mechanisms within connes of the width of a door jamb, whereby clearance is had to attach an outside screen door when desired.

With the above and other objects in view, which will appear as the description proceeds, the invention resides in the novel construction, combination and arrangement of parts, substantially as hereinafter described, and more particularly deined by the appended claims, it being understood that such changes in the precise embodiment of the herein disclosed invention may be made as come within the scope of the claims.

In the accompanying drawings is illustrated one complete example of the physical embodiment of the present invention constructed according to the best mode so far devised for the practical application of the principles thereof.

In the drawings:

Fig. l represents a plan `sectional view of a door mechanism having tted thereto a spring controlled check embodying the features of my invention, with parts broken away and in section to illustrate structural features, the section being partly indicated by line I-I of Fig. 3.

Fig. 2 is a` similar sectional view illustrating the door check mechanism in its full open position.

Fig. 3 is a fragmentary longitudinal sectional view of the same, the section being indicated by line 3 3 of Fig. 1.

Fig. 4 is a cross section through a bracket portion illustrating the pivotal connection between the same and a piston rod.

Fig. 5 is a cross section through the piston rod, the section being indicated by line 5-5 of Fig. 1; and

Fig. 6 is a cross section, as indicated by line 6-6 of Fig. 1.

Referring by characters to the drawings, A indicates a door frame having hinged thereto a door B. Secured to the strips of the door frame is a bracket I having extended therefrom a stud 2 2, journaled upon which stud is a lever 3 having a hub 3 retained thereon by a cotter pin.

The inner looped end of a convolute spring Il engages the hub 3 and the outer coil of said spring is extended tangentially and secured to the base of the bracket by means of a stud I interlocked with a slot in the spring end.

At a predetermined distance from the door hinge, a anged clip 5 is secured thereto. A cylinder head 6 is secured to the clip by a pivot bolt 5', which bolt extends through companion ears of said clip and cylinder head.

A cylinder 'I is secured to the head 6 and the inner end of said cylinder has secured thereto a second head E', which second head is provided with free vent apertures, as shown in Figure 5 of the drawings and also a central slot 8 for sliding engagement with a flat piston rod 9, the slot in said head serving as a guide for the same.

The outer end of the piston rod 9 has secured thereto a piston 9' reeiprocated within the cyl inder. The inner exposed end of the piston rod is formed with an extended elbow 9", which elbow is secured to the bracket I by a pivot bolt I9, the same being approximately at a right angle to the piston rod body 9.

The piston rod 9 at its junction with the elbow section 9" has pivoted thereto a link II the opposite end of which link is pivoted to the end of the lever 3. In the back and forth swing of the door the lever 3 rotates upon its axis stud 2 through an arc of a circle approximating 50 degrees, whereby the coil spring under constant tension is partly wound and unwound.

In the position of the parts assumed in Fig. l, the spring is exerting approximately a maximum tension upon the closed door.

When the door is swung to its open position, as illustrated in Fig. 2, the piston freely moves downwardly Within the cylinder, while at the same time it swings upon its pivot connection t0 exert a slight winding tension upon the spring as the link I I exerts an oscillating movement upon said lever, whereby, due to the angular position with relation to the link and pivot point of the piston elbow, the closing strain of the spring is neutralized, whereby the door may remain open, due to the fact that its load is sufficient to resist closing.

From the foregoing description it will be apparent, due to the toggle link connections between the spring and piston rod, the door is firmly closed, and when fully opened, it may rest in this open position. However, the door closure control may be regulated due to the fact that an air cushion is developed between the piston 9 and head 6. The regulation of this cushion is obtained by a release vent l2 in the head 6, and said vent may be entirely cut off or varied by an adjustable tapered screw I 2' in threaded engagement with the release vent.

I claim:

1. A door check comprising an angular bracket adapted to be secured to a door frame, a stud extending therefrom, a hubbed lever journaled upon the stud, a convolute spring having its inner end secured to the lever hub and its outer end secured to the bracket, a cylinder, a second head mounted upon the inner end of the cylinder, an air ventv Y 2. A door check comprising a stud carrying bracket, a lever having a hub mounted upon the stud, a convolute spring connected to the lever hub and bracket, a headed cylinder adapted to be pivotally secured to a door, a piston therein, a piston rod carried by said piston, the piston rod terminating with an elbow approximately at a, right angle to the main portion of the piston rod, a pivot connection betweenthe piston rod elbow and brackeha toggle'linkvconneting the spring controlled lever and piston rod elbow, and

adjustable means for Venting one end of the cylindex'.

KARL KOLBUS.

REFERENCES CITED The following references are of record in the tile of this patent:

UNITED 4STATES PATENTS Name 

